Swiss Air arrogance

Booked flights from Frankfurt to OR Tambo in August to fly 26 September. Arrived at Swiss Air counter at Frankfurt airport to be told we were bumped off the flight as they had over booked. They worked out us on standby, if there were no shows we worked be allowed on. The cheek of it. You book 45 days in advance and get chosen to be bumped off. What an arrogant bunch of unprofessional people. Beware of Swiss Sir.